ON  A  STILL  FOR  APOTHECARIES. 
13 
beneath.  As  the  most  expensive  portion  of  the  still  is  its  con- 
densing head,  which  does  not  come  in  contact  with  the  liquid,  a 
compromise  may  be  made  in  regard  to  material  by  constructing 
the  boiler  of  copper,  and  the  condenser  of  tinned  iron.  In  re- 
gard to  the  form  of  the  still,  the  accompanying  diagram  will  convey 
a  correct  idea  to  the  reader,  but  to  illustrate  it  to  the  members 
present  I  have  had  a  tinned-iron  still  made,  which  will  be  better 
understood  by  a  few  explanations  of  the  diagram.  This  still 
consists  of  two  distinct  parts,  the  boiler,  A,  and  the  condensing 
head,  B.    The  former  is  cylindrical,  12  inches  deep,  10  inches  in 
diameter,  with  a  tinned  wrought  iron  flange,  a,  an  inch  wide,  and  a 
quarter  of  an  inch  thick.  A  similar  tinned  iron  flange,  «,  is  at- 
tached to  the  base  of  the  head,  which  fits  on  the  flange  of  the 
